<!-- baidu tongji -->
<script>
var _hmt = _hmt || [];
(function() {
  var hm = document.createElement("script");
  hm.src = "https://hm.baidu.com/hm.js?c676936091a9af3267c592c7553f1f7b";
  var s = document.getElementsByTagName("script")[0];
  s.parentNode.insertBefore(hm, s);
})();
</script>

<!-- Katex -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/katex.min.css" integrity="sha384-zB1R0rpPzHqg7Kpt0Aljp8JPLqbXI3bhnPWROx27a9N0Ll6ZP/+DiW/UqRcLbRjq" crossorigin="anonymous">

<!-- The loading of KaTeX is deferred to speed up page rendering -->
<script defer src="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/katex.min.js" integrity="sha384-y23I5Q6l+B6vatafAwxRu/0oK/79VlbSz7Q9aiSZUvyWYIYsd+qj+o24G5ZU2zJz" crossorigin="anonymous"></script>

<!-- To automatically render math in text elements, include the auto-render extension: -->
<script defer src="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/contrib/auto-render.min.js" integrity="sha384-kWPLUVMOks5AQFrykwIup5lo0m3iMkkHrD0uJ4H5cjeGihAutqP0yW0J6dpFiVkI" crossorigin="anonymous"
        onload="renderMathInElement(document.body);"></script>

<!-- favicon -->
<link rel="apple-touch-icon" sizes="180x180" href="/assets/img/favicon/apple-touch-icon.png">
<link rel="icon" type="image/png" sizes="32x32" href="/assets/img/favicon/favicon-32x32.png">
<link rel="icon" type="image/png" sizes="16x16" href="/assets/img/favicon/favicon-16x16.png">
<link rel="manifest" href="/assets/img/favicon/site.webmanifest">
<link rel="mask-icon" href="/assets/img/favicon/safari-pinned-tab.svg" color="#5bbad5">
<meta name="msapplication-TileColor" content="#da532c">
<meta name="theme-color" content="#ffffff">